CVE-2025-39682

Advisory lineage Upstream: 0 Downstream: 94
Modified
Published: 05 Sept 2025, 17:20
Last modified:12 May 2026, 12:06

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
v3.1 (nvd)
EPSS Score
0.01% LOW
0% probability -0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 Sept 2025, 17:20
Published
Vulnerability first disclosed
12 May 2026, 12:06
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.

CVSS Metrics

  • v3.1•HIGH•Score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 2%

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 2902c3ebcca52ca845c03182000e8d71d3a5196f | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677 | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 3439c15ae91a517cf3c650ea15a8987699416ad9 | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e | ≥ 84c61fe1a75b4255df1e1e7c054c9e6d048da417, < 62708b9452f8eb77513115b17c4f8d1a22ebf843 | 6.0

  • linux•linux_kernel

    ≥ 6.0, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.44 | ≥ 6.13, < 6.16.4 | 6.17:rc1 | 6.17:rc2

References (7)